Disk clamping unit with a plurality of particles in a synthetic resin coating formed on either the clamper or the disk table

Abstract

A clamp unit for a disk comprises a disk table on which a disk is mounted and a clamper disposed in association with the disk table for clamping the disk under pressure therebetween. A film is formed on a surface of either one of the disk table and the clamper and formed of a mixture a synthetic resin and a plurality of fine particles disposed in the synthetic resin, both having viscous and elastic property, and some of the particles are exposed outside an outer surface of the film so as to provide an irregular surface having protruded portions.

What is claimed is: 
     
       1. A clamp unit for a disk comprising: a disk table on which said disk is mounted;   a clamper disposed in association with said disk table for clamping said disk under pressure therebetween; and   a film formed on a surface, contacting the disk, of either one of said disk table and said clamper,   wherein said film is formed of a mixture of a synthetic resin and a plurality of particles disposed in the synthetic resin, both having viscous and elastic properties and some of said particles are exposed outside an outer surface of the film so as to provide an irregular surface having protruded portions.   
     
     
       2. A clamp unit for a disk according to claim 1, wherein said particles have diameters in a range of 10 to 50 μm. 
     
     
       3. A clamp unit for a disk according to claim 1, wherein said particles are formed of urethane resin. 
     
     
       4. A clamp unit for a disk according to claim 1, wherein said synthetic resin has a film thickness larger than a maximum diameter of said plurality of particles. 
     
     
       5. A clamper unit for a disk according to claim 1, wherein said film is formed through a spray-coating process. 
     
     
       6. A clamper unit for a disk according to claim 1, wherein said film is coated onto said surface. 
     
     
       7. A clamper unit for a disk according to claim 1, wherein said film is formed through an electro-deposition process. 
     
     
       8. A clamper unit for a disk according to claim 1, wherein each of said particles has a spherical outer shape.